30A Load Programmable Weekly Digital Timer Switch Relay Control Time 7 Days Automatic Switching Machine DIN Rail Mounted. The TM919B (30A load) DIN rail 7-day 24-hour programmable switching timer can automatically turn on and off various electrical appliances at a preset time. It is widely used for 7-day programmable control of street lights, neon lights, signs, lamps, water heaters, air conditioners, advertising signs, rice cookers, fast chargers, sprayers, drip machines, preheaters, agricultural facilities, and broadcast equipment. The digital timer switch has a built-in 1.2V/40mA rechargeable battery to store the program during power outages. It features low power consumption, a high-precision CMOS chip, strong anti-interference capabilities, and easy setting. Specifications: Model: TM919B Power Supply: AC220V Switching Contact: 1 changeover switch Procedure: on/off 16 times per day or week Minimum Interval: 1 minute Time Range: 1 minute ~ 168 hours Color: White Material: ABS + Electronic Components Average Error: 1s / 24h, 25°C Package Contents: 1 * Timer Switch 1 * User Manual (Only the above package content is included. Other products are not included.) Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.